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Appendix J: Instructions for Constructing the Prototype
To construct this device, the following pieces are needed: a 12 inches long aluminum square rail with flange, a 12 inches long aluminum square rail, a 30 and a 26 inches long aluminum square rail, a corner bracket, a loop clamp, a clamping hanger, head screws, wing nuts and paddings.
Materials
Table 6 lists all materials one will need to build The Scissor Stopper.
Table 6
Table 6: Materials Used for Construction
Note: See Appendix B: Bill of Materials for details on cost and part numbers
Tools
The following tools are required to construct the device:
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Band saw
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File
Steps for Construction
Preparing the materials
1. Cut the aluminum square rail into the three pieces of lengths 12’’, 26’’, and 30’’
2. File the edges of the cut aluminum pieces so they are smooth and non-hazardous.
Attaching the rail to the walker
3. Attach the 12 inches long aluminum square rail with flange to the higher horizontal bar of the walker with a loop clamp (Figure 23). There are holes on the aluminum rail, the 2’’ head screw should be used at the third or fourth hole with a wing nut, making the bar stabilized.
Figure 23
Figure 23: Attachment of flanged rail to walker
Assembling the L frame and crossbar
4. Combine the 12’’ and 30’’ aluminum square rails using the corner mounting bracket and the mounting fasteners by mounting them end to end in the shape of an L (Figure 24).
Figure 24
Figure 24: Creation of L-frame with 12-inch and 30-inch square rails
5. Attach the 26’’ bar to the L-shape to prevent the device from swinging. First, a 4’’ head screw should be attached at each end of the bar with a wing nut, in the last hole, to prevent the sideway movements. After that, the bar can be attached to the vertical bar of the L-shape with a 4’’ head screw and a wing nut at the second hole from the bottom. Slide the padding onto the 30-inch square rails (Figure 25).
Figure 25
Figure 25: Attachment of crossbar and padding to L-frame
Combining the L-frame and flanged-rail on walker
6. Attach the L-shape frame with the crossbar and padding to the square rail with a flange (Figure 26). Since the height of the device is adjustable, the anchor points are not fixed. The L-shape should be attached at two arbitrary holes with 4’’ head screws and wing nuts.
Figure 26
Figure 26: Attachment of L-frame to flanged rail
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